I will turn twenty years old next year.

Our project is scheduled to be completed on the twentieth day of the month.

He is good at solving geometry problems.

The 正百二十胞體 is one of the regular polytopes in four dimensions.

The 正二十四胞體 is one of the regular polytopes in four dimensions.

He has two apples.

He made a model of a regular dodecahedron.

He made a model of a regular icosahedron.

My younger sister is twenty-two years old.

It takes twenty minutes to get to my house.